<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登录</title>
    <style>body{font-family:Arial,sans-serif;margin:0;padding:20px;display:flex;justify-content:center;align-items:center;min-height:100vh;background:#f5f5f5}.login-form{background:white;padding:20px;border-radius:5px;box-shadow:0 2px 10px rgba(0,0,0,0.1);width:100%;max-width:300px}input{margin-bottom:10px;padding:8px;width:100%;box-sizing:border-box}button{width:100%;padding:10px;background:#007bff;color:white;border:none;border-radius:4px;cursor:pointer}</style>
</head>
<body>
    <form class="login-form">
        <input type="text" placeholder="用户名/邮箱" required>
        <input type="password" placeholder="密码" required>
        <button type="submit">登录</button>
    </form>
</body>
</html>